That looks like the results I got on my 'Cuda
My build:
Low compression build 8.5:1 87 octane
.060 over dished pistons in the hole
Comp XE284 Hyd. Cam
Eddy Alum. RPM heads
Eddy Air Gap intake
Eddy 500 cfm carb
Stock cast iron big bore manifolds
TTI 2-1/2 exhaust with h pipe
2800-3200 converter...